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bonjour

1 . 40 x 1.5 = 60

2 . 68.50 : 1.5 = 45 .6 L environ

3 . f (x) = 1.5 x

ensemble def = [ 4 ; 90 ]

fonction linéaire

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f (x ) = x² + 5

f ( 1) = 1 + 5 = 6

f ( - 2 ) = 4 + 5 = 9

f ( √2) = 2 + 5 = 7

f ( - √3) = 3 + 5 = 8

x² + 5 = 5

x² = 0

x = 0

x² + 5 = 9

x² = 4

x = √4 ou - √4

x = 2 ou - 2

x² + 5 = 30

x² + 5 - 30 = 0

x² - 25 = 0

( x - 5 ) ( x + 5 ) = 0

x = 5 ou - 5